Electric stop motion for looms



3 Sheets-Sheet 1 Ap 1952 I. s. PORTER ELECTRIC STOP MOTION FOR LOOMSFiled June 26, 1950 Attorneys 3 Sheets-Sheet 2 I. S. PORTER ELECTRICSTOP MOTION FOR LOOMS April 22, 1952 Filed June 26, 1950 NOE u J Z E 0 Aitorneys April 1952 1. s. PORTER ELECTRIC STOP MOTION FOR LOOMS 3Sheets-Sheet 3 Filed June 26, 1950 Inventor 3M m$m L Attorneys PatentedApr. 22, 1952 oFFIcE ELECTRIC STOP MOTION FOR LOOMS Ian Stephen Porter,Barnsley, England Application June 26, 1950, Serial No. 170,453 In GreatBritain July 1, 1949 3 Claims.

This invention relates to electric stop motions of looms for weaving andparticularly to improvements in the stop motions of looms driven by anindependent electric motor provided with an electro-magnetic brake.

The object of the invention is to ensure that the loom will stop at apredetermined point in the cycle of the weaving operation, e. g. whenthe shuttle is in the shuttle box at whatever point in the cycle thebreakage or failure of warp or weft may occur causing the stop motion tooperate.

According to the invention the circuit causing the opening of thecircuit to the electric motor and the application of the brake isprovided with two breaks, the first of which is closed by a relay whenthe stop motion or any of the stop motions, in case of a loom havingmore than one stop motion, comes into operation and the second of whichis closed by a cam which istimed to come into operation at any desiredpoint in the revolution of the crank cam shaft of the loom.

Thus when the relay is operated by the operation of a stop motion thefirst break will be closed but the second break will not be closed bythe cam until the crank shaft has reached the desired point in theweaving cycle.

Although the invention is not limited thereto it is particularlyapplicable to either a single or double warp pile carpet 100m having awarp stop motion, a heald frame stop motion and a knife band stopmotion, and the accompanying drawings, in relation to which the.invention will be described, show this application of the invention.

In these drawings: V

Fig. l is an electrical circuit diagram showing the control of thedriving motor and brake from the three stop motions;

Fig. 2 is a front elevation of a construction of a heald frame suitablefor controlling the heald frame stop motion;

Fig. 3 is an end elevation thereof;

Fig. 4 is a section on line 4-4 of Fig. 2;

Fig. 5 is an elevation of a form of knife band stop motion, and

Fig. 6 is a section on line 5 Fig.5.

The circuit shown in the left hand side of Fig. 1 is a normal circuit toa reversing motor having an electromagnetic brake which comes intoaction to stop the motor immediately the circuit to the motor is broken.In this circuit A, B, and C, represent the three phase leads to themotor and B and C the leads to the electro-magnetic brake. D and Drepresent the forward contactor and the reverse contactor respectivelyand d and d the switches controlling the forward and reverse movementsof the motor, these switches being operated by a starting handle D Thecircuit from the contactors D and D to the motor contains a thermaloverload device D which on coming into operation opens a trip switch (1.Emergency push button operated switches E are also arranged at suitablepositions in the circuit.

Accordin to the invention the circuit contains a switch j which isnormally closed but is opened by an electro-magnet F when a relaycircuit to the latter from a transformer T is energised, the energisingof this relay circuit being controlled by one of the stop motion deviceswhich it is desired should stop the loom.

As previously stated three stop motion devices are shown in Fig. l, i.e. a warp stop motion device W, a heald frame stop motion device 9 and aknif band stop motion device 70 I The stop motion devices r g and k arearranged in parallel and are connected through normally closed contactsr 9 and k to relays r, g and It respectively so that when one of thedevices 1 g or k operates the corresponding relay 1', g or k whichcloses the contacts r 9 or k and consequently the relay circuit to theelectro-magnet F is closed provided; the switch :77. in the circuit isclosed.

The switch it is closed by a cam H operated from the crank shaft of theloom so that the relay circuit to the electro-magnet F is only closedwhen the cam shaft has reached the desired point in the weaving cyclewhen it is desired that the loom should be stopped. This point is usual-1y when the shuttle is in the. shuttle box but the loom can be stoppedat any other point in the weaving cycle by arranging the cam H to closethe switch h at such point.

The contacts 1- g or k can be opened manual- 1y if it is desired to putout of operation the corresponding stop motion device 1 g or W.

A tell tale lamp R, G, or K is arranged in paral lel with the circuitfrom the contacts r g and k to the electro-magnet F and these lamps maybe arranged on a panel P carrying the relays 1-, y and k and contacts 1g and k or they may be arranged on any desired position on the loom.

In order that the heald frame stop motion device can only operate at apredetermined time in the weaving cycle e.-g. when a heald is in orapproaching its bottom position, a switch y controlled by a cam H isarranged between the-device y and the relay g so that the device 9 willnot close the circuit to the relay g until the cam H has closed theswitch g The cam H is operated from the crank shaft of the loom.

- tact bar I0.

It is to be understood that any other stop motion devices e. g. a weftstop motion may introduced into the relay circuit in parallel with thestop motion devices 1', g and k and that such additional device ordevices would control the relay circuit in a similar manner to thedevices 1, g and 7c.

The warp stop motion controlling the device r can be of the conventionalelectrode bar type which is well known.

A knife stop motion for controlling the device It is illustrated inFigs. and 6. In this arrangement the knife severing the pile istraversed backwards and forwards by a cord, catgut or the likehereinafter referred to as the band I and the object of the arrangementis to stop the loom not only if the band breaks but if it becomes tooslack. To achieve this object the support 2 on which is mounted one ofthe pulleys 3 over which the band I passes is carried a on a rod 4slidably mounted in the bracket 5.

, member is formed by a contact 9 carried by but insulated from thebracket 5.

The contact members 8 and 9 will be closed should the band I break orshould it become sufliciently slack that its tension on the pulley 3 isinsufficient to prevent the spring 5 from closing the contacts 8 and 9.

A heald frame stop motion suitable for controlling the stop motiondevice 9 of the relay is shown in Figs. 2, 3 and 4.

In this arrangement two electrode or contact bars III are mountedbetween the side members II of the heald frame near the top thereof andare insulated therefrom; Each bar I 6 is connected to an electricalcontact I2 by a spring loaded contact plunger I3, each contact plungerbeing slidably mounted in a block I4 of compressed fibre Or otherinsulating material secured to one of the side members I I of the frame.The contact I2 is connected by a strip I5 of copper or other material ofgood conductivity to a terminal I6 and this terminal is connected to anelement I8 in the relay circuit by a light spring II, the element I8being mounted on an insulator l9 secured to the frame of the loom.

The heald wires which may be fiat steel type or of wire type withflattened ends, are slotted at 2| near their upper ends and theelectrode or contact bars I!) pass through the slots 2|.

The electrical circuit to the element I8 is only complete as the healdframe is approaching its bottom position, the circuit being completed bya make, and break device such as the switch g and cam H shown in Fig. 1timed with the movement of the heald frame. Normally when the healdframe approaches the bottom position the tension of the yarn passingthrough the eye ZIW- of each heald wire 20 keeps the top of the slot 2Iin the wire clear of the electrode or con- If however a yarn is brokenthe corresponding wire 2!] falls and the top of the 4 slot makes contactwith the electrode or contact bar Ill thereby completing the relaycircuit as the frame approaches its bottom position.

I claim:

1. In an electric stop motion for a warp pile carpet loom driven by anindependent electric motor and having an electromagnetic brake, thecombination of a warp stop motion, a heald frame stop motion and a knifeband stop motion,-a circuit for the motor and the brake, a switch in themotor circuit which is normally closed, a solenoid operative whenenergized to open said switch. a second circuit containing said solenoidand operative when the second circuit is completed to energize thesolenoid and open said switch in the motor circuit, a break in thesecond circuit which is normally open, relays responsive to theoperation of the respective stop motions for closing the second circuitwhen a fault occurs, and a second break in the second circuit which isopened and closed intermittently, the closing of said second break beingtimed to take plact at a desired point in the weaving cycle.

2. 'An electric stop motion for a loom as defined in claim 1, includinga heald'frame comprising side members and heald wires having slots neartheir upper ends. and eyes for the passage of yarn therethrough, andwherein said heald frame stop motion consists of two contact barscarried by the side members of the heald frame, each bar having aspring-loaded plunger and a light spring connecting it to said secondcircuit, said contact bars passing through the slots of the heald wires,and. each heald wire being held out of contact with the respectivecontact bar by the yarn passing through the eye of the Wire butpermitting the wire to fall consequent upon breakage of the yarn tocause the heald wire to 'make contact with the respective contact bar toclose the second circuit, and including means timed to keep the secondcircuit open except when the heald frame isapproaching its bottomposition 7 3.. An electric stop motion for a. loomas defined in claim 1,wherein said knife band stop motion comprises a knife band, a pulleyaround which the knife band passes, a support carrying said pulley and apair of cooperative contacts in said second circuit with the respectiverelay, and a spring which loads said support to a predetermined tensionand which is operative, when the tension of the band on the pulley fallsbelow the tension applied to the support, to move said support to closesaid contacts and cause operation of said relay.

IAN STEPHEN PORTER.

REFERENCES. CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,080,091 Wintermayr Dec. 2, 19131,812,206 Hindle et al'. June 30, 1931 2,429,006 Whitin Oct. 14, 19472,439,031 Wilson Apr. 6, 1948 2,475,505 Kronofi et a1 July 5, 19492,499,887 Sullivan eta1 Mar. '7, 1950

